Safety Operating Procedures For High-voltage Isolating Switches

According to the electrical safety operating procedures, only voltage transformers, lightning arresters, no-load transformers with an excitation current not exceeding 2A, and no-load lines with a current not exceeding 5A can be directly operated with high voltage isolator. This is mainly because high voltage isolator switch itself does not have the ability to extinguish arcs. If hv isolator is operated under load or high current, it is very easy to cause arcing and equipment damage.